My RSS feed is being interpreted as download?

[eluser]taewoo[/eluser]
Thans Ben...

But now I get this error (from FireFox .... IE just doesnt't display at all)

Code:

XML Parsing Error: xml declaration not at start of external entity
Location: http://localhost/feed/rss/user/taewoo
Line Number 1, Column 2: &lt;?xml version="1.0" encoding="utf-8"?&gt;<rss version="2.0"    
-^